Transparency and Randomization on ProGalleries in Wix Studio?

I’m working with pro galleries in the studio editor, and I’d like to have one scrolling automatically underneath a menu - but as far as I can tell there’s no way to add transparency to the images that are scrolling by which makes it impossible to read the menu. Anyone have any solutions for this? The images I’m using are being used in a couple different CMS collections and I’d rather not have to edit and re-upload

I’d also like the order of the images in the pro gallery to be random, but there’s no way to set that in the CMS collection or in the settings on the gallery itself. I currently have them organized in a media gallery so I don’t have to individually add each image to its own item